One liner for extracting a number

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  • D. Alvarado
    #1

    One liner for extracting a number

    Hello,
    Can regular expressions help me here? I want to extract a number
    from a string which will always be of the form "parameter# ##" where
    "###" is an arbitrary number of numeric digits. So if my string
    contained

    parameter24
    parameter8
    parameter90210

    I would want to extract "24", "8", and "90210" respectively.

    Thanks for any help, -
    Tags: None
    • kingofkolt
      #2
      Re: One liner for extracting a number

      "D. Alvarado" <laredotornado@ zipmail.com> wrote in message
      news:9fe1f2ad.0 408141900.21ebd a81@posting.goo gle.com...[color=blue]
      > Hello,
      > Can regular expressions help me here? I want to extract a number
      > from a string which will always be of the form "parameter# ##" where
      > "###" is an arbitrary number of numeric digits. So if my string
      > contained
      >
      > parameter24
      > parameter8
      > parameter90210
      >
      > I would want to extract "24", "8", and "90210" respectively.
      >
      > Thanks for any help, -[/color]

      If the string will always contain only "parameter# ##" and nothing before or
      after "parameter# ##", then this should work:

      $str = "parameter2 4";
      preg_match( "/parameter(\d+)/", $str, $matches );
      print_r( $matches );

      /* OUTPUT:

      Array
      (
      [0] => parameter24
      [1] => 24
      )

      */


        Comment

        • Chris Hope
          #3
          Re: One liner for extracting a number

          D. Alvarado wrote:
          [color=blue]
          > Hello,
          > Can regular expressions help me here? I want to extract a number
          > from a string which will always be of the form "parameter# ##" where
          > "###" is an arbitrary number of numeric digits. So if my string
          > contained
          >
          > parameter24
          > parameter8
          > parameter90210
          >
          > I would want to extract "24", "8", and "90210" respectively.[/color]

          In this example $string is your string like "parameter90210 ". $matches is an
          array containing the matches where $matches[1] is the stuff matched
          inbetween ()

          ereg("parameter ([0-9]*)", $string, $matches);

          --
          Chris Hope - The Electric Toolbox - http://www.electrictoolbox.com/

            Comment

            • Ian.H
              #4
              Re: One liner for extracting a number

              On Sat, 14 Aug 2004 20:00:56 -0700, D. Alvarado wrote:
              [color=blue]
              > Hello,
              > Can regular expressions help me here? I want to extract a number
              > from a string which will always be of the form "parameter# ##" where
              > "###" is an arbitrary number of numeric digits. So if my string
              > contained
              >
              > parameter24
              > parameter8
              > parameter90210
              >
              > I would want to extract "24", "8", and "90210" respectively.
              >
              > Thanks for any help, -[/color]


              preg_match('/([0-9]+)$/', $your_string, $matches);
              $digits = $matches[1];



              Regards,

              Ian

              Note: preg_* is faster and much more flexible than ereg* functions =)

              --
              Ian.H
              digiServ Network
              London, UK
              http://digiserv.net/


                Comment

                • Chung Leong
                  #5
                  Re: One liner for extracting a number

                  "D. Alvarado" <laredotornado@ zipmail.com> wrote in message
                  news:9fe1f2ad.0 408141900.21ebd a81@posting.goo gle.com...[color=blue]
                  > Hello,
                  > Can regular expressions help me here? I want to extract a number
                  > from a string which will always be of the form "parameter# ##" where
                  > "###" is an arbitrary number of numeric digits. So if my string
                  > contained
                  >
                  > parameter24
                  > parameter8
                  > parameter90210
                  >
                  > I would want to extract "24", "8", and "90210" respectively.
                  >
                  > Thanks for any help, -[/color]

                  Well, if it will always be "parameter# ##", then you can simply trim off the
                  first 9 characters of the text.

                  $num = (int) substr($s, 9);


                    Comment

                    • Christopher Finke
                      #6
                      Re: One liner for extracting a number

                      "D. Alvarado" <laredotornado@ zipmail.com> wrote in message
                      news:9fe1f2ad.0 408141900.21ebd a81@posting.goo gle.com...[color=blue]
                      > Can regular expressions help me here? I want to extract a number
                      > from a string which will always be of the form "parameter# ##" where
                      > "###" is an arbitrary number of numeric digits. So if my string
                      > contained
                      >
                      > parameter24
                      > parameter8
                      > parameter90210
                      >
                      > I would want to extract "24", "8", and "90210" respectively.[/color]

                      I can't believe no one has mentioned this:

                      $string = "parameter1234" ;
                      $number = str_replace("pa rameter","",$st ring);

                      Chris Finke


                        Comment

                        • Gary L. Burnore
                          #7
                          Re: One liner for extracting a number

                          On Sun, 15 Aug 2004 01:17:43 -0500, "Christophe r Finke"
                          <chris@efinke.c om> wrote:
                          [color=blue]
                          >"D. Alvarado" <laredotornado@ zipmail.com> wrote in message
                          >news:9fe1f2ad. 0408141900.21eb da81@posting.go ogle.com...[color=green]
                          >> Can regular expressions help me here? I want to extract a number
                          >> from a string which will always be of the form "parameter# ##" where
                          >> "###" is an arbitrary number of numeric digits. So if my string
                          >> contained
                          >>
                          >> parameter24
                          >> parameter8
                          >> parameter90210
                          >>
                          >> I would want to extract "24", "8", and "90210" respectively.[/color]
                          >
                          >I can't believe no one has mentioned this:
                          >
                          >$string = "parameter1234" ;
                          >$number = str_replace("pa rameter","",$st ring);[/color]

                          If I would have seen his post before yours, I would have. :)

                          Wonder why his isn't in the spool. Hmmmmm...... Better go look.


                          --
                          gburnore@databa six dot com
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                            Comment

                            • D. Alvarado
                              #8
                              Re: One liner for extracting a number

                              These are all excellent solutions. You guys rock!

                              "Chung Leong" <chernyshevsky@ hotmail.com> wrote in message news:<ZZKdndAbo OQLYIPcRVn-qw@comcast.com> ...[color=blue]
                              > "D. Alvarado" <laredotornado@ zipmail.com> wrote in message
                              > news:9fe1f2ad.0 408141900.21ebd a81@posting.goo gle.com...[color=green]
                              > > Hello,
                              > > Can regular expressions help me here? I want to extract a number
                              > > from a string which will always be of the form "parameter# ##" where
                              > > "###" is an arbitrary number of numeric digits. So if my string
                              > > contained
                              > >
                              > > parameter24
                              > > parameter8
                              > > parameter90210
                              > >
                              > > I would want to extract "24", "8", and "90210" respectively.
                              > >
                              > > Thanks for any help, -[/color]
                              >
                              > Well, if it will always be "parameter# ##", then you can simply trim off the
                              > first 9 characters of the text.
                              >
                              > $num = (int) substr($s, 9);[/color]

                                Comment

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